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Although all of us are acquainted with the common incandescent light bulb and most of us know (love or dread) CFL bulbs, the LED lightbulb is still a rarity in everyday homes (we've got two and like their cool temperature and spectrum). Here's an explanation from GOOD promoting the investment, because they're still pricey, in these bulbs for the next time you need to replace or add some lighting.

[via GOOD]